Pertusaria coccodes  

Thallus dull greenish or brownish grey, thin to moderately thick, continuous, often bordered by a pale brown or white prothallus, not zonate. Upper surface smooth to ± warted, ± rimose-cracked. Isidia often densely covering parts of the thallus, <0.5 mm diam., globose to ovoid-elongate, rather coarse, ± erect, smooth and firm, often with distinctly darkened grey to grey-green apices, mostly simple but occasionally branched-coralloid, leaving faint pale scars when shed.
Anamorph: no information available.
Teleomorph: ascomata perithecioid apothecia, 1-1.5 mm diam., very rare, in smooth, convex globular warts, with punctiform discs. Asci 2-spored. Ascospores 100-180 (-200) × 30-60 μm.
Chemistry: thallus C–, K+ yellow turning red, KC–, Pd+ orange, ± UV– (norstictic acid).